US1230170A - Telephony. - Google Patents

Description

M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. I913.

1,230.1"?0. Patented June 19, 1917.

1 SHEETS-SHEET INVENTDR MORTON L. JOHNSON ATTQRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. ms.

Patented June 19, 1917.

7 SHEETS-SHEET 2.

W'ITNESSE INVENT-GR MORTON L. JOHNSON ATTORNEY M. L. JOHNSON.

TELEPHONY. I APPLICATION EILED APR. 5, m3.

Patented June 19, 1917.

ISHEETS-SHEET 3.

INVENTOR M'ORTONL. JOHNSON ATTGRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. I913.

l ,239, 1 70. Patented June 19, 1917.

7SHEETS-SHEET 4.

INVENTOR MORTON L. J OHNSON ATTORNE M, L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5, I913.

Patented J une 19, 1917 ISHEETS-SHEET 5.

WITNESSES INVENTOR 5 MORTQNLJOHNSQN g g x0449 AT T URNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED APR. 5. 1913.

1,230, 1 70. Patented June 19, 19w.

ISHEETS-SHEET 6.

WITNES 1 v I NTUR MORTONLII JOHNSON ATTUEY M. L. JOHNSON.

TELEPHONY.

7h .1 H Ow 1 A H m J 0% 4w] H .m ow D1 2w 0 .m mm P A D E IL H N w T A c U P P A PEG; 7

WITNESSES INVENTOR MORTONLJQHNSQN d ATTORNEY entra n snares area anion.

MORTON L. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO FRANK B. COOK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONY.

Specification of Letters Patent.

Patented June 19,1991 7.

Application filed April 5, 1913. Serial No. 759,026.

T 0 all whom it may concern:

Be it known that I, MORTON L. JOHNSON, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephony, of which the following is a full, clear, concise, and exact description, reference being bad to the accompanying drawings, forming a part of this specification.

My invention relates to telephone exchange systems and in one of its aspects relates to that class of telephone exchange systems in which either or both responsive devices and link connectors are automatically connected with calling lines and when the invention is embodied in a telephone exchange system having such characteristics or any of them the invention includes means whereby calling lines may have delayed access to such responsive devices or link connectors when denied immediate access thereto during the presence of the peak of a traflic load whereby the calling subscribers are not put to the burden of reinitiating their calls and, by the nature of .the apparatus which is preferably employed, such calling subscribers whose connections are being delayed will have access to the responsive devices or link connectors when they are freed prior to subscribers later initiating the calls, though obviously the invention is not to be limited to this characteristic.

Certain features herein shown will form the subject matter of a division of this application to which claims originally contained in the present case are to be transferred.

I will explain my invention more fully by reference to the accompanying drawings in which Figure 1 is a general diagramnzatic view illustrating characteristics of the invention, circuits being suggestively illustrated instead of being fully illustrated, in order that the general nature of the invention may be made more clear; and Figs. 2, 3, t, 5, 6 and 7 taken collectively, and in numerical order with the conductors at the long marginal sides of the sheet in alinement, illustrate more in detail one embodiment of the invention, to which embodiment, however, the invention is not to be limited.

Like parts are indicated by similar char acters of reference throughout the different figures.

Referring first more particularly to Fig. 1, subscribers stations 201 and 202 are provided with selector switches A that are individual thereto and which, in the embodiment of the invention illustrated, include traveling wipers and waiting contacts that are contained in circuits established between subscribers though this characteristic of the system may be modified. As exhibited, the waiting contacts of the selector switches A that are included within the normal range of operation of the wipers of these selector switches constitute terminals of link connectors which may be described as answering terminals of such link connectors, the connecting ends of the link connectors being provided with operator controlled terminals such, for example, as the connecting plugs 1. Where, these connecting ends of the link connectors are in the form of plugs the lines are provided with jacks 2 which may be multipled before the various operators positions, whereby connections 'may be completed between calling and called lines. As illustrated, the link connectors of each group at eac h operators position is provided with some form of responsive. device such, for example, as an operators telephone 3, this responsive device being common to the link connectors and so controlled that it is limited to association with one calling line at a time and is freed when the operator has attended to the connection desired. The wipers of each selector switch A are adapted to extend beyond their normal range of travel and in so doing to leave the waiting contacts that constitute the answering ends of the aforesaid link connectors to move over other waiting contacts that constitute terminals of conductors having complemental multiple terminals forming parts of finder switches B, B, B. In Fig. 1 the waiting contacts encountered first by the wipers in moving in a clockwise direction are the answering ends of the link connectors which terminate in the plugs 1 while the lower waiting contacts are connected with the waiting contacts of the switches B. The wipers of these latter switches constitute or include what may be said to be the answering terminals of link connectors which are here shown as terminating in especially provided plugs 4, 4, though the invention is not to be limited to the employment of plugs 4, 4, supplied in addition to the plugs 11, the additional plugs 4, 4 being shown mainly for the sake of simplicity. The conductors extending from the switches A to the waiting contacts of the switches B are further extended into connection with relay mechanism indicated at C which are employed for setting an idle switch D into operation, one of these switches being thus set into operation when a selector switch A selects an idle relay mechanism C. The switches D constitute subselector switches in that they perform a very important function of the main selector switches A when these latter switches are working within their normal range of operation, namely the selection of an idle responsive device 3, switches D operating for this purpose through the intermediation of relay mechanism E. When an idle responsive device is selected relay mechanism F individual thereto is set into operation for setting a switch B into operation, the wipers of the switch B set into operation becoming electrically connected with the conductor that couples the calling line with the relay mechanism C whereby such calling line is extended into connection with the connecting terminal 4 individual to the operating switch B and the operators telephone equipment 3 common to the group. of link connectors including such connecting plug 4. The switches B are preferably arranged in pairs each pair having relay mechanism F common thereto whereby, if one switch B of a pair is busy, its companion may be selected. By the equipment thus far very generally illustrated and described it is apparent that calling lines are adapted to be extended directly into connection with link connectors or responsive devices common to groups of link connectors during the normal traffic conditions of the system. If there should be momentary excessive trafiic in the system the calling subscribers that occasion the excess will be thrown into association with the conductors leading to the switches B and the relay equipment C so that the calling subscribers will set the switches D into operation, such operation continuing until a responsive device 3 has become free whereupon the switches D will cease their operation and effect the extension of the calling subscribers lines into connection with the connecting plugs (here shown as extra plugs 4) through the agency of switches B pertaining to such plugs, these plugs and switches being individual to the responsive devices 3 that are selected by the switches D. The waiting contacts of the switches D being restricted in number in the preferred embodiment of the invention, even though the system is large, the

waiting calling subscribers who are associated with such switches D are most likely to become associated with responsive devices 3 before other calling subscribers can be come associated with such responsive devices within the normal range of operation of their selector switches A. Signals G serve to indicate to an attendant the number of calling lines waiting for connection with responsive devices 3. Signal lamps H individual to the switches D, when constantly glowing indicate that their switches D are in constant operation, showing to an attendant that no responsive devices 3 are being selected. Each time a signal H ceases to glow it indicates that the associate switch A has made a selection of a responsive device 3. Signal lamps T, individual to switches B and their plugs 4, are caused to glow when their corresponding plugs 4 are taken for use by the operator and preferably when such plugs are inserted within the jacks of called lines. Counting devices K are individual to the operators positions,

the plugs 4 at each position and the link connectors of which these plugs form parts having a counting device K common thereto. These counting devices serve to integrate or totalize the connections made at the operators positions by the plugs 44. A totalizing count L sums the counts made by the counters K. Counting devices M individual to the operators positions serve each to count all the connections made at the position pertaining thereto including those connections made by way of the plugs 1 and those made by way of the plugs 4. A totalizing count N serves to sum the counts made by the counters M. The rate of total traffic at different portions of the day at the different operators positions may be determined with the aid of time counters O operated by a timing device P and electro-magnetic inking devices Q also controlled by the timing device P, the elements 0 and Q operating upon tapes R to mark the time thereupon. Connection counters S are in multiple with the counters M and co operate with the elements Q to record the counts upon the tapes B. An extra time counter T cooperates with a totalizing counter U and extra electro-magnetic inking devices to totalize the connections of all of the operators positions upon a tape W.

The apparatus illustrated at X includes elements similar in function to the elements 0, Q, R, S, T, U, V, and W excepting that the apparatus at X is employed to count the connections made by way of the plugs 4.

Referring now moreparticularly to Figs. 2 to 7 inclusive, I will describe more in detail the equipment entering into the preferred embodiment of the invention. The equip ment at each of the telephone stations 201 and 202 includes a telephone switch hook 5,

a call bell 6, condenser 7, telephone transmitter 8, and a telephone receiver 9, the switch hook having a normal contact for normally connecting the bell bridge between the sides of the associate telephone line and an alternate contact for connecting the telephone receiver and transmitter between the sides of the associate telephone line when the receiver is removed from its switch hook. The sides of each telephone line terminate in the armature switches of a cutoff relay 10, the line sides being normally continued by way of the normal contacts of the armature switches of the relay 10 into connection with the two upper armature switches of a switching relay 11 and by way of the normal contacts of these two upper armature switches intoconnection with the grounded coils of a line relay 12, the upper coil of this line relay being grounded'through a com mon battery 13 while the lower coil is directly grounded. When a calling subscriber removes his telephone receiver from its switch hook the circuit normally opened at the associate condenser 7 is closed through the telephone bridge containing the trans mitter 8 and receiver 9 whereby the line relay 12 is energized. When this relay 12 is energized its upper grounded armature switch engages its contact to close circuit through the motor magnet 14, the interrupter relay 15 and its armature switch, the side switch wiper 16 in its first position, and the grounded common battery 13. The m0- tor magnet 14 will continue in, operation until the wiper 17 engages an ungrounded waiting Contact whereupon circuit through the private magnet 18, which was initially closed by the motor magnet 14, is opened to step the side switch wipers 16 and 19 into their second positions, the wiper 16 in its second position opening the circuit of the motor magnet 14 whereby the wiper 17 is maintained at rest and the wipers 20 and 21 coupled with the wiper 17 are also brought to rest in engagement with waiting contacts that are either the answering terminals of the link connectors having the connecting plugs 1 or are the terminals of conductors extending to the switches B, according to the extent of movement of the wipers. The waiting contacts connected with the plugs 1 are, of course in excess of the waiting con tacts that pertain to the relay devices C and are encountered first in the travel of the wipers 17, 20 and 21. The waiting contacts of the various primary selector switches A which are similarly positioned are in multiple connection and each set of multiply connected waiting contacts are either connected with a plug 1 individual thereto or a set of conductors pertaining to a relay organization C so that any switch A has access to any plug 1 in any operators position in its normal range of operation and in its increased range of operation is adapted to have association with any relay organization C. Referring now more particularly to the relationship of the connecting plugs 1, the ground upon the waiting contacts of the wipers 17 is present when the responsive devices individual thereto are not free for selection and while the desired connections remain uncompleted. vWhen the connections have been completed such ground is established at the lower armature switch of relay 31. When a particular responsive device has been selected and when any of the link connectors of the group to which this responsive device is common is free for selection the grounds are absent at 22 and 31 so that the circuit of the private magnet 18 is opened under the circumstances above described. When the side switch wiper 16 is brought into its second position a circuit is established traceable from the common grounded battery 13, said side switch wiper in its second position, the winding of the switching relay 11, to the upper grounded armature switch of the relay 24 and the con tact then engaged thereby. The two upper armature switches of relay 11 now en gage their alternate contacts to extend the sides of the calling line into connection with the wipers 20 and 21 and portions of the selected link connector extending from the waiting contacts engaged by the wipers 20 and 21. The relay 24, in its energized condition, serves to place ground upon the wiper 17 by way of the side switch wiper 19 in its second position and the upper grounded armature switch of relay 24 to prevent the intrusion of another switch A upon the waiting contacts that have been automatically connected with wipers 17 20 and 21. When relay 11 is energized the circuit of the relay 24 is opened so that the ground last mentioned is removed. This ground is replaced at 22, Fig. 6, when the responsive device or operators telephone 3 is selected and prior to the completion of the connection desired. The operators telephone outfits 3 distributed among their positions are associated each with a relay 25 (Fig. 6) individual thereto and whose circuit is established over a calling line by a path traceable from the grounded battery 13, the right hand winding of the relay 25, the upper armature switch of relay 26 and its normal follow-up contact, the waiting contact engaged by the wiper 20, the upper armature switch of relay 11 and its alternate contact, the upper armature switch of relay 10 and its normal contact, one side of the calling line, the other side of the calling line, the lower armature switch of relay 10 and its normal contact, the inter mediate armature switch of relay 11 and alternate contact, the wiper 21 and the contact engaged thereby, the intermediate armature switch of relay 26 and its fol- 13o low-up contact, the relay 27 the left hand winding of relay 25, to ground. Re-

lay 27 operates to establish a signaling circuit through the signal device 28 indi vidual to the plug 1 so as to inform the operator which particular link connector has been automatically selected. The relay 25 is energized to attract its armature switches, a circuit being established traceable from the grounded battery 13, the relay 29, the right hand armature switch of relay 25 and its alternate contact, to ground. The relay 29 is provided with as many grounded armature switches as there are plugs 1 in the group of link connectors to which the relay 29 is common and these armature switches, when attracted, serve to make the link con nectors of a group unselectable whether such link connectors are taken for use or not, while the relay 25 is energized, this relay being energized for the purpose of associating the responsive device 3 pertaining to this group of link connectors with the calling line, the responsive device or telephone 3 being connectedin bridge of the conductors leading to the relay 25. The ground established upon the link connectors is traceable from the grounded armature switches 22 to the lowermost armature switches of re: lays 26 by way of their contacts thence to the waiting contacts of the wiper 17 in the various switches A, the ground removed at the upper armature switch of relay 24 thus being replaced. Any other calling line is now prevented from selecting a link connector in the group to which the telephone 3 is common while such telephone is in service to enable the operator to attend to the call being initiated. The subscriber having informed the operator of the connection desired the operator will take the plug 1 and apply its tip to the thimble of the jack of the called line. If the line is idle there is no test manifestation. If the desired line is another calling line the testing coil 30 of the operators receiver is included in the testing circuit that may be traced from the grounded coil 30 through the uppermost ar mature switch of the relay 31 and-its normal contact, the upper normally connected pair of contacts of the ringing key 32, the tip of the testing plug 1, the thimble of the tested jack, the upper armature switch of relay 33 and its alternate contact, the resistance coil 34, to the grounded battery 13, whereby a busy manifestation occurs in the operators receiver. If the desired line is another called line the test circuit instead of continuing by way of the upper armature switch of the relay 33 continues by way of the heel of the plug inserted in such other called line thence to the relay 31 and the grounded battery 13 pertaining to the plug in the jack of the tested'called line.

Assuming that the line desired is idle,

the operator will insert the plug 1 in a jack of a called line or in any other suitable way will bring the selected link connector into connection with the called line whereupon the relay 31 is included in a circuit trace called line is disconnected from the called line so that when the called subscriber responds his selector switch will not operate. lVhen the relay 31 is thus energized its grounded lower armature switch establishes a circuit traceable from this switch through the winding of relay 26 to the grounded battery 13 thus energizing the relay 26 whose two upper armature switches leave their normal follow-up contacts and engage their alternate contacts. These armature switches in leaving their follow-up contacts open the circuit of the relay 25 so that its armature switches are released whereby the circuit of the relay 29 is opened to remove the ground at 22 from association with the link connectors in the group containing'the employed plug 1 whereby the operator's telephone or responsive device 3 is reduced to a selectable condition. When the two upper armature switches of relay 26 engage their alternate contacts circuit is closed through relay 34: by a path which is now apparent and that includes the calling line. At the same time the circuit of the signal device 28 is opened. The relay 3a is thus governed by the calling subscriber and has as one of its functions the government of the circuit of a calling subscribers supervisory signal 35. When the called subscriber has responded to the ringing current impressed upon his line following the depression of the key 32 an energizing circuit is established for the relay 36 by way of the called subscribers line and the bridge at the called subscribers station that includes the telephone receiver and transmitter. The relay '36 is thus within the control of the called subscriber and has for one of its functions the government of a circuit for the which, when depressed, serves to establish a circuit for the relay 29 by a path which includes the upper grounded contact of the listening key 38 and other connections which are apparent. When the relay 29 is energized it operates to prevent any other calling line from selecting the operator who is listening into an established connection by means of the key 38. When the subscribers are through their conversation and the plug is removed from the jack the released relay 31 removes the ground at its lower armature switch from the multiply connected buttons at the wipers 17 of the diiierent switches A, the removal of this ground opening the circuit of the relay 11 whereupon the armature switches of this relay are restored to normal. The lower grounded armature switch of relay 11 will thereupon establish a'circuit for the release magnet 39 that includes the previously closed off normal switch 40 whereby the wipers of the employed switch A are restored in a counter clockwise direction to normal. The side switches 16 and 19 at the same time are placed in their first posi-' tions.

If the operators happen to be fully taxed at any period during the operation of the exchange the selector switches A of calling subscribers who attempt to initiate calls during such time will pass beyond the waiting contacts that are connected with the plugs 1 and will move over the additional contacts that are associated with the relay equipment C by the conductors intervening between such relay equipment and such additional waiting contacts. The selector switch set into operation by any such calling subscriber will cease its movement when the wiper 17 engages the unground ed contact individual to some relay mechanism C, each of the relay mechanisms C have a group of similarly posi tioned multiply related contacts distributed among the banks of waiting contacts of the wiper 17 of the different selector switches A. When the wiper 17 engages such an ungrounded waiting contact the wipers 20-and 21 are broughtto rest when the wiper 17 and the calling line is extended into connec tion with the wipers 20 and 21 to bring the relay 41 into a closed circuit that includes the calling line. The relay 41 of the selected relay mechanism C thereupon attracts its armature switches, the intermediate armature switch of relay 41 places the ground upon the waiting contact with which the employed wiper 17 is in engagement to replace the ground removed at the upper armature switch of relay 24. The upper armature switch of energized relay 4E1 closes an apparent circuit through the relay 42 that is common to the relays 41 of a group of relay equipments C. In Fig. 1 there are four relay equipments C illustrated, the two upper relay equipments pertaining to one sub-selector switch D and the two other relay equipments pertaining to another selector switch D so that each selector switch D pertains to the group of lines having a pair of relay equipments C, as the system is shown. It is not desirable to have two switches D operate at the same time, hence the controlling circuit of either switch must be closed by the other when idle and open when the other is in operation. The controlling circuit-of the lower switch D is governed at the right hand armature switch o relay 4% of the upper switch D and the controlling circuit of the upper switch D is controlled at the right hand armature switch of the relay 44 of the lower switch D. lhe relays 16 of the two switches D are in parallel relation when the wipers 49 happen to be simultaneously connected with the same multiply related contacts so that the relay 46 of the switch second to operate will not be sufiiciently energized owing to its parallel relation with the other relay 46 to cause its wiper 49 to remain at rest in connection with the waiting contact in multiple with the contact engaged by the wiper 49 of the first switch D. Relay 42 establishes a circuit traceable from its grounded armature switch, the contact then engaged by such switch, the relay 43, to the grounded battery 13. The relay 13 attracts its armatures witch which is grounded to establish a circuit traceable from this switch, the contact of this switch, the right hand armature switch of relay 4A and its normal contact, the relay 45, to the grounded battery 13. The left hand grounded armature switch of relay 45 thereupon establishes a circuit traceable from this grounded armature switch, the contact of this switch, the armature switch of relay 46 and its contact, the motor magnet 4:7, the armature switch of interrupter relay 48, the relay 48, to the grounded battery 13. The motor magnet d6 is shown as being equipped with a ratchet wheel 48 that is in actuating relation with the single wiper 49 of the associate subselector switch D, this wiper continuing in rotation until it engages a waiting contact with which the grounded battery 13 has been connected, whereupon the relay 46 will be energized to open the circuit of the motor magnet 47 permitting the wiper. 49 to re main at rest. The waiting contacts of each switch D are individual to the difierent operators positions, similarly positioned waiting contactsof the two switches being in multiple connection. The circuit relation of each waiting contact of the switch D with the equipment of the operators position to which such waiting contact is individual is controlled by the right hand armature switch of the relay 25. \Vhen an operator at a position is free for selection her relay 25 individual to her posi tion is deenergized so that the right hand armature switch is capable of placing the battery 13 upon the corresponding waiting contacts of the switches D by a path that includes the grounded battery 13, the relay 29, the right hand armature switch of relay 25, the normal contact of this armature switch and the relay F. When the battery 13 is included in circuit with the relay &6 the relays F and 29 are energized, the functions of the armature switches of the relay 29 having hitherto been explained. When a relay F is energized (there being one 'such relay individual to each responsive device 3) a circuit is established traceable from vthe grounded contact of the armature switch of relay F, said armature switch, the uppermost armature switch of relay of a switch 13 belonging to the energized relay F, the upper armature switch of relay 51 and its contact, the relay 52, to the grounded battery 13." The left hand armature switch of relay 52 thereupon closes circuit for the motor magnet 53, an interrupter relay 54:, the side switch wiper 55 in its first position, and the grounded battery 13. The motor magnet 53 continues to operate to drive the wipers 56, 57, 58 and 59 until the wiper 58 finds an ungrounded contact whereupon the private magnet 60 which was initially energized by the motor magnet 53 is included in open circuit to move the side switch wipers 55, 61 and 62 to their second positions, the side switch wiper 55 in its second position opening the circuit of the motor magnet 53 to permit the wipers 56, 57, 58, 59 to remain at rest. A side switch wiper 55 in its second position establishes a circuit for the relay 5O traceable from the grounded battery 13, the side switch Wiper 55 in its second position, the relay 50, the side switch wiper 62 in its second position, the right hand armature switch of relay 52, to the grounded contact of this armature switch. The energized relay 50 opens a circuit for the relay 52 and the ground previously established at the right hand armature switch of this relay 52 upon the wiper 59, being new removed, is elsewhere replaced. The ground connection established upon the wiper 59 serves to complete the circuit for the switching relay 63 of the relay equipment C. The two upper armature switches of the relay 63 leave their follow-up normal contacts and engage their alternate contacts to connect the wipers 56 and 57 with thecalling line, the connection of the calling line being further extended by way of the intermediate armature switches of the relay 50, when attracted. Thecontacts of these intermediate switches of the relay 50 are connected with the two upper, armature switches of relay 26 of a link connector having a connecting plug 4. The calling line is neeeaao extended by way of the normally positioned upper armature switch of relay 26 and their normal follow-up contacts into connection with the relay 25 individual to the selected operators responsive device. The relays 25 and 64: are now in closed circuit with the calling line. Relay 25 opens the circuit for the previously energized relay F, the circuit for relay 29 at the same time being preserved at the alternate contact for the right hand armature switch of relay 25 which engages this alternate contact before it leaves its normal follow-up contact so that the link connectors of the group having the selected responsive device 3 are not' subjected to selection for the time being. lVhen the circuit for the relay F is thus opened its armature switch opens a circuit for the relay 52 so that when the relay 50 is energized the circuit for the relay 52 of the switch B companion to the operated switch 13 will not be operated. If another call of the kind being described should be initiated while the switch B is employed the companion switch B will be of service owing to the closed circuit of the relay 52 of the second switch B established at the upper armature switch of the relay 50 of the first switch B and its alternate contact, this circuit also including the upper armature switch of the relay 50 of the second switch B and the contact then engaging the same. When the relay 64 is energized a circuit is established by its upper armature switch for a calling signal device 65 individual to the selected link connector extending to the plug 4-, the signal device 65 performing a function similar to that of the signal device 28. The intermediate armature switch of relay 64: places a ground upon the wiper 59 by way of the contact engaging the same to replace the ground previously removed at the right handarniature switch of relay 52 for the purpose of maintaining the relay 63 energized. The lowermost grounded armature switch of the energized relay 63 establishes ground upon the contact engaged by the employed wiper 17 and other contacts in multiple therewith for preserving the circuit of the relay 11 and also for preventing other switches A from resting in connection with these same waiting contacts. Other features of the link connectors terminating in the plugs 4 are similar to features of the link connectors terminating in the plugs 1 and similar parts having similar functions are given similar characters of reference. The

' subscriber having informed the operator or the number desired the operator will first test the desired line in the same manner in which the desired line was tested with a connecting plug 1 and with similar results. Assuming the desired line to be idle, the operator will insert the plug 4 in the jack of such line with similar resul is as hitherto described in connection with the use of a plug 1 and will signal the called subscribers by depressing the ringing key 32. When both subscribers connected by way of the plug 4 are and to restore the equipment of the calling line to normal in the manner previously described. The lowermost armature switch of relay 50 of the employed switch B when released establishes circuit for the release magnet 51 which causes the wipers 56, 57, 58 and 59 and the side switch wipers 55, 61 and 62 to be restored to normal. It may be added that I prefer to employ a tone device 66 which is constantly operating and in a circuit which is intermittently interrupted by the device 66, this circuit being in inductive relation with the circuit that includes the relay 12 or the relay 41 and the calling line. The tone device causes a mani- :testation in the calling subscribers telephone until a responsive device 3 has been selected whereupon such tone device is excluded from circuit owing to the exclusion of the relay 12 or the relay 41 as the case may be.

The lowermost armature switches of the relay 41 control the circuits of the signals G by circuits which are apparent, these signals serving to indicate to the operator the number of overflow calls which have been unattended to, the signal lamps glowing until the calling lines in association therewith have become connected with overflow plugs 4 or responsive devices 3. During the operation of either switch D its relay 44 isv energized, the left hand armature switch of such relay maintaining the circuit for the associate signal H closed while the associate switch D is in operation. The attendant will observe the lamp at H and will note that when it is not glowing the switch D is unable to find an idle responsive device 3. The lower armature switches of the relays 31 individual to the link connectors having the plugs 4 serve, when attracted, to establish the circuits for the signal devices I individual to plugs 4 so that an attendant will know the number of connections being maintained by way of the overflow link connectors having the plugs 4, the signal devices T glowing during the maintenance of the connections eflected by means of the plugs 4.

The lowermost armature switches 64 in dividual to the overflow plugs 4, when attracted upon selection of idle responsive devices 3, serve to establish circuit for why 67 which is common to the overflow plugs 4 at each position. The circuit for the relay 67 is opened when the plug 4 corresponding tov the energized relay 64 is inserted in the jack of 21 called line. When the relay 67 is energized its armature switch engages its alternate contact to establish circuit for a sluggishly operating relay 68. When the relay 67 is denergized its armature switch engages its normal contact to establish a circuit in cooperation with the armature switch of the sluggishly operating relay 68 that includes the counting device K individual to the position having the relay 67. The drawing indicates three counters K which may be of any usual or preferred totalizing or integrating character, there being one such clement K for each operators position to record the number of connections established at each operators position by way of the overflow plugs 4 at such position. A summation counter L totalizes the counts made by the three counters K being operated. The counters M are individual to the diflerent operators positions and the responsive devices 3 thereat to record the total number of connections made by the plugs 1 and 4 at each position. This result is secured by the left hand armature switch of relay 25, when attracted, upon the selection of a responsive device 3, and the subsequent release of this armature switch when any plug is inserted in a jack, this armature switch in being released cooperating with the armature switch of the sluggishly operating relay 69 to close circuit through the counting mechanism M pertaining to the group of plugs 1, 4 having the relay 25. The relay N serves as a summation device to totalize the counts made by the several counters M. The magnets S are in multiple with the magnets M, which magnets S operate printing wheels that serve to indicate the number of completed connections efl'ected at the operators positions to which the magnets S are individual. The magnet U forms a part of a summation device operated each time a magnet S is operated to adjust a printing wheel to totalize the con nections made at all operators positions. The printing magnets Q and V cooperate with the magnets S and U to print the record upon the tapes R and W. The printing devices having the magnets O and T serve to record-the times upon the tapes R and W, the magnets O and T and the magnets Q and V being timed in their operation by a timing device P. The devices indicated at X are" controlled similarly to the devices 0, Q, S, T, U and V to record the connec tions made and the time during which such connections are made with the aid of the overflow equipment, the circuit relating between the devices at X and the devices K, L being similar to the circuit relations thatexist between the devices M, N and the recording devices 0, S, etc. The elements K, L, M, N, S, T, etc., are jointly controlled by the calling subscriber and operator so that the operator is not able to eflect the counts without the aid of the calling subscriber, this being one object of my present invention irrespective of the means employed for effecting the association between the telephones of calling subscribers and the operators and for e ecting connection between subscribers. I do not wish to be limited, however, to the employment of the calling subscribers line that operates in combination with the operators equipment for ac complishing this result.

In the claims I use the term telephone line extensions meaning thereby additional connections supplied to telephone lines for operating purposes such, for example as the extensions which couple the responsive devices 3 with calling lines or the extensions which couple the connecting plugs or other connecting devices with calling lines.

While the selector switches A are shown as being individual to the lines and while these selector switches remain in the connection established between calling and called stations and while they are employed to select idle responsive devices associated with link connectors I do not wish to be limited to these various characteristics nor do I wish to be limited to other details of construction and circuit arrangement illustrated as changes may readily be made without departing from the spirit of the invention, but having thus described my invention 1 claim as new and desire to secure by Letters Patent the following 1. A telephone exchange system including telephone lines extending from stations to an exchange; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by thev aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed.v

2. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such oper ators responsive devices are freed.

3. A telephone exchange system including telephone lines extending from stations to an exchange; .extensions for said telephone lines; automatically operating switches for connecting calling telephone lines with said extensions; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the line extensions have been appropriated and operating to connect telephone line extensions with calling lines when such extensions are freed, there being means operated by the additional automatically oper ating switches for connecting the extensions with calling lines independently of the ad ditional automatically operating switches.

l. A telephone exchange system including telephone lines extending from stations to an exchange; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the operators responsive devices with calling lines independently of the additional automatically operating switches.

5. A telephone exchange system including telephone lines extending from stations tb an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the responsive devices with calling lines independently of the additional automatically, operating switches.

6. A telephone exchange system including telephone lines extending from stations to an exchange; link connectors for constituting extensions of calling telephone lines and serving to connect calling telephone lines with called telephone lines; automatically operating switches for selecting idle link connectors and connecting them with ca1ling telephone lines; and additional auto matically operating switches selectable by the aforesaid automatically operating switches when all of the link connectors have been appropriated and operating to connect link ating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when "all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional auto matically operating switches for connecting the responsive devices and link connectors with calling lines independently of the additional automatically operating switches.

S. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the responsive devices and link connectors with calling lines independently of the additional automatically operating switches.

9. A telephone exchange system including telephone lines extending from stations to an exchange; extensions for said telephone lines automatically operating switches for connecting calling telephone lines with said extensions; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the line extensions have been approe priated and operating to connect telephone line extensions with calling lines when such extensions are freed, there being third automatically operating switches operated by the additional or second automatically operating switches for connecting the extensions.

with calling lines independently of said additional or second automaticallyv operating switches.

10. A telephone exchange system including telephone lines extending from stations to an exchange; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when'all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being third automatically operating switches operated by the additional or second automatically operating switches for connecting the operators responsive devices with calling lines independently of said additional or second automatically operating switches.

11. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically opcrating switches for connecting calling telephone lines with idle operators responslve devices; and additional automatically op erating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such .operators responsive devices are freed, there being third automatically operating switches operated by the additional or second automatically opera-ting switches for connecting the responsive devices with calling lines independently of said additional or second automatically operating switches.

12. A telephone exchange systemincluding telephone lines extending from stations to an exchange; link connectors for constituting extensions of calling telephone lines and serving to connect calling telephone lines with called telephone lines; automatically operating switches for selecting idle link connectors and connectingthem with calling telephone lines; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the link connectors have been appropriated and operating to connect link connectors with calling lines when such link connectors are freed, there being third automatically operating switches operated by the additional or sec- 0nd automatically operating switches for connecting the link connectors with calling lines independently of the additional automatically operating switches.

13. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group"; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices'with calling lines when such operators responsive devices are freed, there being third automatically operating switches operated by the additionalor second automatically operating switches for connecting the responsive devices and link connectors with calling lines independently of said additional or second automatically operating switches. I

14. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being third automatically operating switches operated by the additional or second automatically operating switches for connecting the re-v sponsive devices and link connectors with calling lines independently of the additional automatically operating switches.

15. A telephone exchange system including telephone lines extending from stations to an exchange; extergions for said telephone lines; automatically operating switches for connecting calling telephone lines with said extensions; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the line extensions have been. appropriated and operating to connect telephone line extensions with calling lines when such extensions are freed, there being means operated by the additional automatically operating switches for connecting the extensions with calling lines independently of the' additional automatically operating switches, there also being means governed by the aforesaid means for freeing the additional automatically operating switches when they have operated for their purpose.

16. A telephone exchange system including telephone lines extending from stations to an exchange; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the operators responsive devices with calling lines independently of the additional automatically operating switches, there also being means governed by the aforesaid means for freeing the additional automatically operating switches when they have operated for their pur ose.

1 A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically oper ating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the responsive devlces with calling lines independently of the additional automatically operating switches, there also being means governed by the aforesaid means for freeing the additional automatically operating switches when they have operated for their purpose.

18. A'telephone exchange system including telephone lines extending from stations to an exchange; link connectors for constituting extensions of calling telephone lines and serving to connect calling telephone lines with called telephone lines; automati cally operating switches for selecting idle link connectors and connectin them with calling telephone lines; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the link connectors have been appropriated andoperating to connect link connectors with-callingvlines when such link connectors are freed, there beingmeans operated by the additional automatically operating switches for connectng the lmk connectors with calling lines in ependently of the additional automatically operating switches, there also being means governed by the aforesaid means for freeing the additional automatically operating switches when they have operated for their purpose.

SEIH

19. A telephone exchange system including telephone lines extendin'g from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being means operated by the additional automatically operating switches for connecting the responsive devices and link connectors with calling lines independently of the additional automatically operating switches,

there also being means governed by the aforesaid means for freeing the additional automatically operating switches when they have operated for this purpose.

20. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices; automatically operating 1 'i astgspmis'cr (tlEiBiEGl ,saan 1c nomnon: 1h t i Ikl l 31' ibis r erned by the third automatically operating switches for freeing said additional or second automatically operating switches when they have operated for their purpose.

22. A telephone exchange system including telephone lines extending from stations to an exchange; operators responsive devices; automatically operating switches for connectingcalling telephone lines with idle operators responsive device's and additional automatically operating switches selectable .switches for freeing said additional or second automatically operating switches when they have operated for their purpose.

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have been appropriated and operating to connect link connectors with calling lines when such link connectors are freed, there being third automatically operating switches operated by'the additional or second automatically operating switches for connecting the link connectors with calling lines independently of the additional automatically operating switches, there being means governed by the third automatically operating switches for freeing said additional or second automatically operating switches when they have operated for their purpose.

25. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices each common to the link connectors of a group; automatically operating switches for connecting calling telephone lines with idle operators responsive devices; and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive de vices with calling lines when such operators responsive devices are freed, there being third automatically operating switches operated by the additional or second automatically operating switches for connecting the responsive devices and link connectors with calling lines independently of said additional or second automatically operating switches, there being means governed by the third automatically operating switches for freeing said additional or second automatically operating switches when they have operated for their purpose.

26. A telephone exchange system including telephone lines extending from stations to an exchange; groups of link connectors for uniting lines in conversation; operators responsive devices; automatically operating switches for connecting calling telephone lines with idle operators responsive devices and additional automatically operating switches selectable by the aforesaid automatically operating switches when all of the responsive devices are in service and operating to connect operators responsive devices with calling lines when such operators responsive devices are freed, there being third automatically operating switches operated by the additional or second automatically operating switches for connecting the responsive devices and link connectors with calling lines independently of the additional automatically operating switches, there being means governed by the third automatically operating switches for freeing said additional or second automatically operating switches when they have operated for their purpose.

In witness whereof, I hereunto subscribe my name this thirty-first day of March,

MORTON L. JOHNSQN.

Witnesses:

G. L. GRAGG, E. L.

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